<?php
/**
 * Smarty Internal Plugin Resource Extends
 *
 * @package Smarty
 * @subpackage TemplateResources
 * @author Uwe Tews
 * @author Rodney Rehm
 */

/**
 * Smarty Internal Plugin Resource Extends
 *
 * Implements the file system as resource for Smarty which {extend}s a chain of template files templates
 *
 * @package Smarty
 * @subpackage TemplateResources
 */
class Smarty_Internal_Resource_Extends extends Smarty_Resource {

	/**
	 * populate Source Object with meta data from Resource
	 *
	 * @param Smarty_Template_Source   $source    source object
	 * @param Smarty_Internal_Template $_template template object
	 */
	public function populate(Smarty_Template_Source $source, Smarty_Internal_Template $_template=null)
	{
		$uid = '';
		$sources = array();
		$components = explode('|', $source->name);
		$exists = true;
		foreach ($components as $component) {
			$s = Smarty_Resource::source(null, $source->smarty, $component);
			if ($s->type == 'php') {
				throw new SmartyException("Resource type {$s->type} cannot be used with the extends resource type");
			}
			$sources[$s->uid] = $s;
			$uid .= $s->filepath;
			if ($_template && $_template->smarty->compile_check) {
				$exists == $exists && $s->exists;
			}
		}
		$source->components = $sources;
		$source->filepath = $s->filepath;
		$source->uid = sha1($uid);
		if ($_template && $_template->smarty->compile_check) {
			$source->timestamp = $s->timestamp;
			$source->exists = $exists;
		}
		// need the template at getContent()
		$source->template = $_template;
	}

	/**
	 * populate Source Object with timestamp and exists from Resource
	 *
	 * @param Smarty_Template_Source $source source object
	 */
	public function populateTimestamp(Smarty_Template_Source $source)
	{
		$source->exists = true;
		foreach ($source->components as $s) {
			$source->exists == $source->exists && $s->exists;
		}
		$source->timestamp = $s->timestamp;
	}

	/**
	 * Load template's source from files into current template object
	 *
	 * @param Smarty_Template_Source $source source object
	 * @return string template source
	 * @throws SmartyException if source cannot be loaded
	 */
	public function getContent(Smarty_Template_Source $source)
	{
		if (!$source->exists) {
			throw new SmartyException("Unable to read template {$source->type} '{$source->name}'");
		}

		$_rdl = preg_quote($source->smarty->right_delimiter);
		$_ldl = preg_quote($source->smarty->left_delimiter);
		$_components = array_reverse($source->components);
		$_first = reset($_components);
		$_last = end($_components);

		foreach ($_components as $_component) {
			// register dependency
			if ($_component != $_first) {
				$source->template->properties['file_dependency'][$_component->uid] = array($_component->filepath, $_component->timestamp, $_component->type);
			}

			// read content
			$source->filepath = $_component->filepath;
			$_content = $_component->content;

			// extend sources
			if ($_component != $_last) {
				if (preg_match_all("!({$_ldl}block\s(.+?){$_rdl})!", $_content, $_open) !=
				preg_match_all("!({$_ldl}/block{$_rdl})!", $_content, $_close)) {
					throw new SmartyException("unmatched {block} {/block} pairs in template {$_component->type} '{$_component->name}'");
				}
				preg_match_all("!{$_ldl}block\s(.+?){$_rdl}|{$_ldl}/block{$_rdl}|{$_ldl}\*([\S\s]*?)\*{$_rdl}!", $_content, $_result, PREG_OFFSET_CAPTURE);
				$_result_count = count($_result[0]);
				$_start = 0;
				while ($_start+1 < $_result_count) {
					$_end = 0;
					$_level = 1;
					if (substr($_result[0][$_start][0],0,strlen($source->smarty->left_delimiter)+1) == $source->smarty->left_delimiter.'*') {
						$_start++;
						continue;
					}
					while ($_level != 0) {
						$_end++;
						if (substr($_result[0][$_start + $_end][0],0,strlen($source->smarty->left_delimiter)+1) == $source->smarty->left_delimiter.'*') {
							continue;
						}
						if (!strpos($_result[0][$_start + $_end][0], '/')) {
							$_level++;
						} else {
							$_level--;
						}
					}
					$_block_content = str_replace($source->smarty->left_delimiter . '$smarty.block.parent' . $source->smarty->right_delimiter, '%%%%SMARTY_PARENT%%%%', substr($_content, $_result[0][$_start][1] + strlen($_result[0][$_start][0]), $_result[0][$_start + $_end][1] - $_result[0][$_start][1] - + strlen($_result[0][$_start][0])));
					Smarty_Internal_Compile_Block::saveBlockData($_block_content, $_result[0][$_start][0], $source->template, $_component->filepath);
					$_start = $_start + $_end + 1;
				}
			} else {
				return $_content;
			}
		}
	}

	/**
	 * Determine basename for compiled filename
	 *
	 * @param Smarty_Template_Source $source source object
	 * @return string resource's basename
	 */
	public function getBasename(Smarty_Template_Source $source)
	{
		return str_replace(':', '.', basename($source->filepath));
	}

}

?>